<template>
  <div class="component-upload-image">
    <el-upload
      ref="imageUpload"
      :action="`/api/not404`"
      :http-request="uploadHttp"
      list-type="picture-card"
      :before-upload="handleBeforeUpload"
      :limit="limit"
      :on-error="handleUploadError"
      :on-exceed="handleExceed"
      :on-remove="handleDelete"
      :show-file-list="true"
      :headers="headers"
      :file-list="fileList"
      :on-preview="handlePictureCardPreview"
      :class="{ hide: this.fileList.length >= this.limit }"
    >
      <i class="el-icon-plus" />
    </el-upload>

    <!-- 上传提示 -->
    <div v-if="showTip" slot="tip" class="el-upload__tip">
      请上传
      <template v-if="fileSize">
        大小不超过 <b style="color: #f56c6c">{{ fileSize }}MB</b>
      </template>
      <template v-if="fileType">
        格式为 <b style="color: #f56c6c">{{ fileType.join("/") }}</b>
      </template>
      的文件
    </div>

    <el-dialog
      :visible.sync="dialogVisible"
      title="预览"
      width="800"
      append-to-body
    >
      <img
        :src="dialogImageUrl"
        style="display: block; max-width: 100%; margin: 0 auto"
      >
    </el-dialog>
  </div>
</template>

<script>
import { getToken } from '@/utils/auth'
import { queryGetStsToken } from '@/api/oss/oss'
import OSS from 'ali-oss'
import * as imageConversion from 'image-conversion'

export default {
  props: {
    value: [String, Object, Array],
    ossId: [String, Number],
    // 图片数量限制
    limit: {
      type: Number,
      default: 5
    },
    // 大小限制(MB)
    fileSize: {
      type: Number,
      default: 5
    },
    // 文件类型, 例如['png', 'jpg', 'jpeg']
    fileType: {
      type: Array,
      default: () => ['png', 'jpg', 'jpeg']
    },
    // 是否显示提示
    isShowTip: {
      type: Boolean,
      default: true
    }
  },
  data() {
    return {
      number: 0,
      uploadList: [],
      dialogImageUrl: '',
      dialogVisible: false,
      hideUpload: false,
      baseUrl: process.env.VUE_APP_BASE_API,
      headers: {
        Authorization: 'Bearer ' + getToken()
      },
      fileList: [],
      client: {}
    }
  },
  computed: {
    // 是否显示提示
    showTip() {
      return this.isShowTip && (this.fileType || this.fileSize)
    }
  },
  watch: {
    value: {
      handler(val) {
        if (val) {
          // 首先将值转为数组
          const list = Array.isArray(val) ? val : this.value.split(',')
          // 然后将数组转为对象数组
          this.fileList = list.map((item) => {
            if (typeof item === 'string') {
              item = { name: item, url: item }
            }
            return item
          })
        } else {
          this.fileList = []
          return []
        }
      },
      deep: true,
      immediate: true
    }
  },
  created() {
    this.queryGetStsTokenFn()
  },
  methods: {
    // 重置fileList
    resetFileList() {
      this.fileList = []
    },
    // 上传前loading加载
    handleBeforeUpload(file) {
      let isImg = false
      if (this.fileType.length) {
        let fileExtension = ''
        if (file.name.lastIndexOf('.') > -1) {
          fileExtension = file.name.slice(file.name.lastIndexOf('.') + 1)
        }
        isImg = this.fileType.some((type) => {
          if (file.type.indexOf(type) > -1) return true
          if (fileExtension && fileExtension.indexOf(type) > -1) return true
          return false
        })
      } else {
        isImg = file.type.indexOf('image') > -1
      }

      if (!isImg) {
        this.$modal.msgError(
          `文件格式不正确, 请上传${this.fileType.join('/')}图片格式文件!`
        )
        return false
      }
      if (this.fileSize) {
        const isLt = file.size / 1024 / 1024 < this.fileSize
        if (!isLt) {
          this.$modal.msgError(`上传头像图片大小不能超过 ${this.fileSize} MB!`)
          return false
        }
      }
      this.$modal.loading('正在上传图片，请稍候...')
      this.number++
    },
    // 文件个数超出
    handleExceed() {
      this.$modal.msgError(`上传文件数量不能超过 ${this.limit} 个!`)
    },
    // 上传成功回调
    handleUploadSuccess(fileName, id, url) {
      this.uploadList.push({ name: fileName, id: id, url: url })
      this.uploadedSuccessfully()
      this.handleUpdateOssId()
    },
    // 删除图片
    handleDelete(file) {
      const findex = this.fileList.map((f) => f.name).indexOf(file.name)
      if (findex > -1) {
        this.fileList.splice(findex, 1)
        this.handleUpdateOssId()
        this.$emit('input', this.listToString(this.fileList))
      }
    },
    // 上传失败
    handleUploadError() {
      this.$modal.msgError('上传图片失败，请重试')
      this.$modal.closeLoading()
    },
    // 上传结束处理
    uploadedSuccessfully() {
      if (this.number > 0 && this.uploadList.length === this.number) {
        this.fileList = this.fileList.concat(this.uploadList)
        this.uploadList = []
        this.number = 0
        this.handleUpdateOssId()
        this.$emit('input', this.listToString(this.fileList))
        this.$modal.closeLoading()
      }
    },
    // 预览
    handlePictureCardPreview(file) {
      this.dialogImageUrl = file.url
      this.dialogVisible = true
    },
    // 对象转成指定字符串分隔
    listToString(list, separator) {
      let strs = ''
      separator = separator || ','
      for (const i in list) {
        if (list[i].url) {
          strs += list[i].url + separator
        }
      }
      return strs != '' ? strs.substr(0, strs.length - 1) : ''
    },
    // 返回ossId
    handleUpdateOssId() {
      const ossIds = this.fileList.map(e => e.id)
      this.$emit('update:ossId', ossIds.toString())
    },

    // 获取oss的sts令牌
    async queryGetStsTokenFn() {
      const res = await queryGetStsToken()
      const {
        AccessKeyId,
        AccessKeySecret,
        Expiration,
        SecurityToken
      } = res

      const client = new OSS({
        // yourRegion填写Bucket所在地域。以华东1（杭州）为例，yourRegion填写为oss-cn-hangzhou。
        region: 'oss-cn-shenzhen',
        // 从STS服务获取的临时访问密钥（AccessKey ID和AccessKey Secret）。
        accessKeyId: AccessKeyId,
        accessKeySecret: AccessKeySecret,
        // 从STS服务获取的安全令牌（SecurityToken）。
        stsToken: SecurityToken,
        // 填写Bucket名称，例如examplebucket。
        bucket: 'playlet-video-asset'
      })
      this.client = client
    },

    // 压缩图片
    compressFile(file) {
      return new Promise((resolve, reject) => {
        //
        imageConversion.compressAccurately(file, 600).then(res => {
          console.log(res)
          resolve(res)
        })
      })
    },

    // 上传
    async uploadHttp(event) {
      const file = event.file
      // 压缩图片，默认100KB，现在500KB
      const compressFile = await imageConversion.compressAccurately(file, 500)
      console.log(file, compressFile)

      const name = event.file.name
      const fileName = '/tmp/' + name

      const options = {
        callback: {
          // 设置回调请求的服务器地址，且要求必须为公网地址。
          url: process.env.VUE_APP_BASE_API + '/common/oss/ossCallBack',
          // 设置回调请求消息头中Host的值，即您的服务器配置的Host值。
          // host: 'yourHost',
          // 设置发起回调时请求body的值。
          body: 'bucket=${bucket}&object=${object}&etag=${etag}&size=${size}&mimeType=${mimeType}&imageInfo.height=${imageInfo.height}&imageInfo.width=${imageInfo.width}&imageInfo.format=${imageInfo.format}&type=${x:type}',
          // 设置发起回调请求的Content-Type。
          contentType: 'application/x-www-form-urlencoded',
          // 设置发起回调请求的自定义参数。
          customValue: {
            type: 'video_cover' // 短剧库封面
          }
        }
      }
      // object-name可以自定义为文件名（例如file.txt）或目录（例如abc/test/file.txt）的形式，实现将文件上传至当前Bucket或Bucket下的指定目录。
      this.client.put(fileName, compressFile, options).then(res => {
        const data = res.data.data
        const { id, url } = data
        this.handleUploadSuccess(name, id, url)
        // 一下为生成图片处理的签名 URL t_1000表示第一秒视频图片，常用来作为视频封面图
        // const imgRes = this.video_url + '?x-oss-process=video/snapshot,t_1000,f_jpg,w_0,h_0,m_fast'
      })
    }

  }
}
</script>
<style scoped lang="scss">
// .el-upload--picture-card 控制加号部分
::v-deep.hide .el-upload--picture-card {
  display: none;
}
// 去掉动画效果
::v-deep .el-list-enter-active,
::v-deep .el-list-leave-active {
  transition: all 0s;
}

::v-deep .el-list-enter,
.el-list-leave-active {
  opacity: 0;
  transform: translateY(0);
}
</style>
